Just got this from Halcyon this morning:
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Halcyon Voluntary Recall of Select Explorer 40 BC's (Serial Numbers Listed Below)

Halcyon Manufacturing has identified a very small number of Halcyon Explorer-40 BC's sold after July 2005 that could develop problems over time. In these few units it is possible that the over pressure valve (OPV) could delaminate, causing the BC to leak. It is unlikely that most of these units will experience any problems; yet, given its rigorous desire to produce only the finest quality equipment, Halcyon would like to ensure this problem does not affect the safety or convenience of our customers. This problem was identified during regular quality control evaluations in which a lamination machine (RF welder) showed slight inconsistency during production. The machine has been replaced and the few BC's affected have been identified by quality control. Halcyon is seeking to minimize any inconvenience to our customers. To this end, all Halcyon distributors have been notified and are prepared to assist any affected customers. If you have an affected BC (see serial numbers below) please return the unit to any Halcyon dealer; you may also contact your local distributor for replacement. If you have any questions or prefer to work directly with Halcyon please contact Halcyon tech services via the contact information listed below.

http://www.halcyon.net/recall/index.shtml

Halcyon Contact Information:
1-800-HALCYON (800-425-2966) x307
techservices@halcyon.net

EXPLORER 40 Serial Numbers

255015005 255015091 355147031 355147058

255015008 255015092 355147033 355147059

255015015 255015099 355147035 355147061

255015016 355147001 355147036 355147062

255015025 355147003 355147037 355147064

255015031 355147006 355147038 355147065

255015035 355147010 355147040 355147068

255015053 355147011 355147043 355147070

255015054 355147013 355147045 355147072

255015057 355147014 355147046 355147073

255015061 355147016 355147047 355147074

255015062 355147017 355147049 355147075

255015063 355147018 355147050 555603031

255015067 355147019 355147051 555603034

255015068 355147020 355147052 555603039

255015073 355147022 355147053 555603062

255015075 355147023 355147054 555603070

255015081 355147026 355147055 C44679024

255015083 355147028 355147056

255015085 355147030 355147057

Thank you,

Casey McKinlay
Vice President
Chief Operating Officer
Halcyon Manufacturing (www.halcyon.net)